Kestrel Instruments Blog

  1. How Heat Stress Is Managed at the Boston Marathon—And How to Check Race Day Conditions for Free

    How Heat Stress Is Managed at the Boston Marathon—And How to Check Race Day Conditions for Free The Boston Marathon is known for its challenging course and unpredictable spring weather. From cool starts to warmer midday conditions, race day can shift quickly, making heat stress monitoring a critical part of athlete safety. Understanding Race Day Heat Conditions Air temperature is only one part of the equation. During endurance events like... Read more...
  2. OSHA's Heat NEP Is Back — And It Has Teeth: What Employers Must Know for 2026

    OSHA's Heat NEP Is Back — And It Has Teeth: What Employers Must Know for 2026 Effective April 10, 2026 | Directive CPL 03-00-024 OSHA's National Emphasis Program (NEP) on heat-related hazards was fully revised and relaunched on April 10, 2026, replacing the original 2022 directive for a new five-year enforcement term. This isn't a paperwork update - it expands which industries are targeted, raises documentation expectations... Read more...
  3. What Is Humidex? Canada’s “Feels Like” Temperature—Now on the Kestrel 5400

    What Is Humidex? Canada’s “Feels Like” Temperature—Now on the Kestrel 5400 When people say, "It feels hotter than the temperature,” they're describing something real. Humidex is widely used in Canada as a "feels like” temperature-but it's not a heat stress standard like WBGT. Instead, it's a regional metric used in Canadian weather reporting and workplace guidance to describe how heat and humidity combine to impact ... Read more...
  4. How to Monitor Heat Stress at Work: A Practical Guide to WBGT and OSHA Compliance

    How to Monitor Heat Stress at Work: A Practical Guide to WBGT and OSHA Compliance As the Occupational Safety and Health Administration (OSHA) continues enforcement of its National Emphasis Program (NEP) on heat, one expectation is becoming clear: Employers must be able to accurately monitor heat stress conditions and act on that data. But what does effective heat stress monitoring actually look like in the field? This guide ... Read more...
  5. Is a 3-Minute Hydration Break Enough? What WBGT Tells Us About Real Heat Risk

    Is a 3-Minute Hydration Break Enough? What WBGT Tells Us About Real Heat Risk Hydration breaks are now guaranteed at every match in the 2026 FIFA World Cup™. It’s a clear step forward for player welfare. But it raises an important question: Is three minutes enough to reduce heat stress in high-heat conditions? What Hydration Breaks Actually Do Hydration breaks are designed to give players a short window to... Read more...
  6. Waterless WBGT with Measured Wind: A Simpler, More Reliable Approach to Heat Stress Monitoring

    Waterless WBGT with Measured Wind: A Simpler, More Reliable Approach to Heat Stress Monitoring Heat stress monitoring is becoming increasingly important across industries such as construction, manufacturing, athletics, and occupational safety. Many organizations rely on Wet Bulb Globe Temperature (WBGT) to determine when conditions may become unsafe for workers or athletes. But how WBGT is measured can significantly affect the ... Read more...
  7. Which 2026 World Cup Host Cities Face the Highest Heat Risk?

    Which 2026 World Cup Host Cities Face the Highest Heat Risk? With the 2026 FIFA World Cup ™ fast approaching, heat and climate conditions are becoming a major part of the conversation, especially in outdoor venues across North America. While FIFA's universal hydration breaks help mitigate short-term heat strain, understanding regional heat risk is essential for players, staff, and spectators alike. ... Read more...
  8. Heat Index Monitoring for Worker Safety

    Heat Index Monitoring for Worker Safety As heat-related illnesses continue to rise across occupational environments, the need for accurate, on-site, defensible heat monitoring has never been greater. Heat safety programs increasingly depend on real-world environmental data—not estimates from nearby weather stations or mobile apps—to guide decisions that protect people from heat ... Read more...
  9. Your First Time Using the Kestrel 5400: What to Know & What to Do

    Your First Time Using the Kestrel 5400: What to Know & What to Do When it comes to heat safety, accuracy matters most. The Kestrel 5400 Heat Stress Tracker with LiNK provides reliable, on-site Wet Bulb Globe Temperature (WBGT) measurements exactly where people work or play. Built-in guidelines, customizable alerts, and data logging so you can make informed, confident, and trackable decisions. Here's how to get ... Read more...
  10. FIFA’s Hydration Break Rule Explained: What It Means for the 2026 World Cup

    FIFA’s Hydration Break Rule Explained: What It Means for the 2026 World Cup As temperatures rise across summer host cities, heat stress has become one of the most discussed topics ahead of the FIFA World Cup 2026™. In response, FIFA has introduced a new hydration break policy designed to protect players. What the New FIFA Hydration Break Policy Actually Says On December 7, 2025, FIFA confirmed that: “Three-... Read more...

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